You could ride it with a caller a few times, but be careful. If you ride it too much on the one horse he will start antisipating the movements and that can be really bad when you compete.
OR you could be a total loonie like a lot of other dressage riders out there and set up an arena in your lounge room and "ride" the test yourself. Or you could run around the dressage arena on foot like you would be doing the test. I'm NOT crazy
Something that I do when I'm at work is get a bit of paper and draw the arena on it and laminate it and get a pen that you can wipe off and use a solid line like this _________ as walk, broken line like this for trot - - - - and a wave line for canter ~~~~~~~